ÌâÄ¿ÄÚÈÝ
(9·Ö)ÈçͼËùʾ£¬Ä³Í¬Ñ§ÔÚ±¡±Úƽµ×ÊÔ¹ÜÖÐ×°ÈëһЩɳ×Ó£¬¹Ü¿ÚÃܷ⣬ÖƳÉÒ»¸ö¡°ÍÁÃܶȼơ±¡£µ±°ÑËü·ÅÈëË®ÖÐÊúֱƯ¸¡Ê±£¬ÊԹܶ³öË®ÃæµÄ¸ß¶ÈΪ5cm£»µ±°ÑËü·ÅÈëijҺÌåÖÐÊúֱƯ¸¡Ê±£¬ÊԹܶ³öÒºÃæµÄ¸ß¶ÈΪ7cm£®ÈôÊԹܺÍɳ×ÓµÄ×ÜÖÊÁ¿Îª30g£¬ÊԹܵĺá½ØÃæ»ýΪ1.5cm2£¬Ë®µÄÃܶÈΪ1¡Á103kg/m3£®Çó£º
£¨1£©ÔÚË®ÖÐƯ¸¡Ê±£¬Ë®¶ÔÊԹܵײ¿µÄѹǿ£®
£¨2£©Ä³ÒºÌåµÄÃܶȣ®£¨È¡g = 10N/kg£¬±£ÁôÁ½Î»Ð¡Êý£©
£¨1£©ÔÚË®ÖÐƯ¸¡Ê±£¬Ë®¶ÔÊԹܵײ¿µÄѹǿ£®
£¨2£©Ä³ÒºÌåµÄÃܶȣ®£¨È¡g = 10N/kg£¬±£ÁôÁ½Î»Ð¡Êý£©
1£©ÊԹܺÍɳ×ÓµÄ×ÜÖØG = m g = 30¡Á10-3kg¡Á10N/kg=" 0.3" N¡¡¡¡¡¡¡¡¡¡¡¡¡¡1·Ö
ÓÉÓÚÊÔ¹ÜƯ¸¡ÔÚË®Ã棬F¸¡= G = 0.3N¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡1·Ö
¸ù¾Ý¸¡Á¦²úÉúµÄÔÒò£¬ÊԹܵײ¿Êܵ½ÏòÉϵÄѹÁ¦ÎªFѹ= F¸¡= G = 0.3N¡¡¡¡¡¡¡¡1·Ö
Ë®¶ÔÊԹܵײ¿µÄѹǿΪp = = 2000Pa¡¡¡¡¡¡¡¡¡¡¡¡¡1·Ö
£¨2£©ÊÔ¹ÜλÓÚË®ÃæÒÔϵĸ߶ȣº¡¡1·Ö
ÊÔ¹Ü×ܳ¤¶È£º¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡1·Ö
µ±ÊÔ¹ÜƯ¸¡ÓÚË®Ãæʱ£¬F¸¡= G¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡1·Ö
µ±ÊÔ¹ÜƯ¸¡ÓÚijҺÌåʱ£¬¦ÑÒºg (l¨Dh2)S=mg¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡1·Ö
ÓÉ¢Ù¢ÚÁ½Ê½µÃ ¡1·Ö
ÓÉÓÚÊÔ¹ÜƯ¸¡ÔÚË®Ã棬F¸¡= G = 0.3N¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡1·Ö
¸ù¾Ý¸¡Á¦²úÉúµÄÔÒò£¬ÊԹܵײ¿Êܵ½ÏòÉϵÄѹÁ¦ÎªFѹ= F¸¡= G = 0.3N¡¡¡¡¡¡¡¡1·Ö
Ë®¶ÔÊԹܵײ¿µÄѹǿΪp = = 2000Pa¡¡¡¡¡¡¡¡¡¡¡¡¡1·Ö
£¨2£©ÊÔ¹ÜλÓÚË®ÃæÒÔϵĸ߶ȣº¡¡1·Ö
ÊÔ¹Ü×ܳ¤¶È£º¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡1·Ö
µ±ÊÔ¹ÜƯ¸¡ÓÚË®Ãæʱ£¬F¸¡= G¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡1·Ö
µ±ÊÔ¹ÜƯ¸¡ÓÚijҺÌåʱ£¬¦ÑÒºg (l¨Dh2)S=mg¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡1·Ö
ÓÉ¢Ù¢ÚÁ½Ê½µÃ ¡1·Ö
ÂÔ
Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿